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Method and apparatus for monitoring refrigerant-cycle systems

  • US 7,275,377 B2
  • Filed: 08/11/2004
  • Issued: 10/02/2007
  • Est. Priority Date: 08/11/2004
  • Status: Active Grant
First Claim
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1. A monitoring system for monitoring the operation of a refrigerant-cycle system, comprising:

  • a plurality of condenser unit sensors configured to measure operating characteristics of a condenser unit, said plurality of condenser unit sensors comprising a sensor to sense when a compressor in said condenser unit is drawing electrical power, said plurality of condenser unit sensors further comprising at least a first temperature sensor, said condenser unit comprising a condenser and a compressor;

    one or more evaporator unit sensors configured to measure one or more operating characteristics of an evaporator unit, said one or more evaporator unit sensors comprising at least a second temperature sensor configured to measure an output air temperature of said evaporator, said evaporator unit comprising an evaporator and an air-handler fan;

    one or more ambient sensors configured to measure one or more ambient conditions;

    at least one current sensor configured to measure current provided to a motor connected to a fan; and

    a processing system configured to calculate an efficiency of said refrigerant-cycle system using at least a portion of the data from each of said plurality of condenser unit sensors, at least a portion of the data from each of said one or more evaporator unit sensors, at least a portion of the data from said one or more ambient sensors, and at least a portion of the data from the at least one current sensor.

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